Polyacrylonitrile-containing amphiphilic block copolymers: self-assembly and porous membrane formation

The development of hierarchically porous block copolymer (BCP) membranes via the application of the self-assembly and non-solvent induced phase separation (SNIPS) process is one important achievement in BCP science in the last decades. In this work, we present the synthesis of polyacrylonitrile-cont...

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Veröffentlicht in:Polymer chemistry 2023-10, Vol.14 (42), p.4825-4837
Hauptverfasser: Gemmer, Lea, Niebuur, Bart-Jan, Dietz, Christian, Rauber, Daniel, Plank, Martina, Frieß, Florian V, Presser, Volker, Stark, Robert W, Kraus, Tobias, Gallei, Markus
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container_end_page 4837
container_issue 42
container_start_page 4825
container_title Polymer chemistry
container_volume 14
creator Gemmer, Lea
Niebuur, Bart-Jan
Dietz, Christian
Rauber, Daniel
Plank, Martina
Frieß, Florian V
Presser, Volker
Stark, Robert W
Kraus, Tobias
Gallei, Markus
description The development of hierarchically porous block copolymer (BCP) membranes via the application of the self-assembly and non-solvent induced phase separation (SNIPS) process is one important achievement in BCP science in the last decades. In this work, we present the synthesis of polyacrylonitrile-containing amphiphilic BCPs and their unique microphase separation capability, as well as their applicability for the SNIPS process leading to isoporous integral asymmetric membranes. Poly(styrene- co -acrylonitrile)- b -poly(2-hydroxyethyl methacrylate)s (PSAN- b -PHEMA) are synthesized via a two-step atom transfer radical polymerization (ATRP) procedure rendering PSAN copolymers and BCPs with overall molar masses of up to 82 kDa while maintaining low dispersity index values in the range of = 1.13-1.25. The polymers are characterized using size-exclusion chromatography (SEC) and NMR spectroscopy. Self-assembly capabilities in the bulk state are examined using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) measurements. The fabrication of isoporous integral asymmetric membranes is investigated, and membranes are examined by scanning electron microscopy (SEM). The introduction of acrylonitrile moieties within the membrane matrix could improve the membranes' mechanical properties, which was confirmed by nanomechanical analysis using atomic force microscopy (AFM). Porous nanostructures were derived after self-assembly of amphiphilic poly(acrylonitrile)-containing block copolymers. The introduction of acrylonitrile moieties within the membrane matrix was shown to improve the membranes' mechanical properties.
doi_str_mv 10.1039/d3py00836c
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The introduction of acrylonitrile moieties within the membrane matrix could improve the membranes' mechanical properties, which was confirmed by nanomechanical analysis using atomic force microscopy (AFM). Porous nanostructures were derived after self-assembly of amphiphilic poly(acrylonitrile)-containing block copolymers. 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source Royal Society Of Chemistry Journals
subjects Asymmetry
Block copolymers
Electron microscopy
Mechanical properties
Membranes
Microscopy
NMR spectroscopy
Phase separation
Polyacrylonitrile
Polyhydroxyethyl methacrylate
Polystyrene resins
Self-assembly
Size exclusion chromatography
X-ray scattering
title Polyacrylonitrile-containing amphiphilic block copolymers: self-assembly and porous membrane formation
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